Gallner and Martin will play siblings James and Lara, who believe the twisted delusions their dead mother passed on to them. The episode will be the 19th one of the season and will mark the third time in the director's chair for Gubler. The actor, who plays Reid, made his Minds

directorial debut two years ago and last year helmed Paget Brewster's first exit from the show. (Brewster announced earlier this week that she will leave again at the end of the season.)

Gallner, who played Beaver on Mars, has also appeared on Smallville as Bart Allen and on CSI: NY as Mac's stepson. Martin stars as Hank's daughter, Becca, on Californication, which is currently in its fifth season.Criminal Minds airs Wednesdays at 9/8c on CBS.